Should I get a blood test

Kelsey

March 28th-March 31st. Had a period. March 31st into April 1st, has unprotected sex. April 2nd, took a plan b. April 8th, bled like a period. Didn’t have a period April 28th. It is now May 27th. And still have yet to see a period or signs of a period. Took a test May 21st, came out negative. Should I get a blood test done? Or wait til June to see if a period ever comes?